How does voting for someone other than Trump lead to a loss of House and Senate seats?
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Simple, because Trump will have at least 3 times more votes as any other candidate, not delegates but votes. Trump voters not gonna stand for any convention shenanigans ie. giving him the boot, and will punish some GoPe House and Senate members. Yeah it will happen.
OI think you're right, though. I think the party is completely torn, and there doesn't seem much willingness on either side to even attempt to bring the different factions together. Likely going to be a GOP defeat of historical proportions.